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Low current consumption nrf52 with UART

Dear all,

I'm using nRF52810, I want to achieve low power consumption(<200uA). I have disabled easyDMA. Right now I want to know how to turn on/off uart anytime we wish.

What function should I use?

Should I focus on the main.c or nrf_drv_uart.c?

I have tried to call function like app_uart_close() in mian.c, but it didn't work. Please give me more guide on this.

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